Apparatus for dressing the grinding wheels used for gearing



b' 1939- M. G. E. PHILIPPE APPARATUS FOR mmssme THE GRINDING WHEELS ussn FOR (HEARING Filed April 30, 1937 3 Sheets-Sheet 1 1 Fig.1

I/VVENTOF? MAURICE G. E. PHILIPPE ATTORNEY July 11, 1939.

APPARATUS FOR DRESSING THE GRINDING WHEELS USED FOR GEARING Filed April so- 1937 '3 Sheets-Sheet 2 Fig.

INVENTOR MAURICE at. PHILIPPE ATTORNEY-Y M. G. E. PIHILIPPE 2,156,020

y 11, 3 M. e. E. PHILIPPE 2,166,020

APPARATUS FOR DRESSING THE GRINDING WHEELS USED FOR GEARING Filed April 30, 1937 3 She'ets-Sheet 3 Fig.6. 17 46' I N INVENTOR MA URICE E. PHILIPPE By wwwzm ATTORNEY UNITED STATES PATENT OFFICE APPARATUS FOR nrmssme'rnn GRINDING WHEELS USED FOR GEARING Maurice Germain Edmond Philippe, Courbevoie, France, assignor to Socit dite: La Bougie B. G., Paris, France ApplicationApril 30, 1937, Serial No. 140,071 In France May 13, 1936 4 Claims. (Cl. 125-11) The present invention has for its object an ing directly connected thereto and carrying thereapparatus for dressing the grinding wheels used with diamond M, which diamond is adapted to for gearing teeth. Apparatus of this type have describe, while cutting the grinder, the curve heretofore been proposed and the purpose of these serving as the generatrix, which in this case is a 5 was to render, after a determined period of use, portion of an evolute of the gear-wheels, to be 5 the grinding wheels their original profile. As the ground. grinding of gears has to be done often, with a very For this purpose, the said rod can be given two high precision, for example to a thousandth of different movements. On the one hand, it is cona millimetre, the mechanism which effects the nected by a. pivot joint [6 to a link H which isl0 dressing of the grinding wheels must be extremely pivoted at its other end to a fixed point [8; on the 10 precise and must be easily manipulated, in order other hand, it is slidable in a guide l2 formed in to obtain the microscopic displacements of the a radial member 9 which is pivoted at the centre hard point which works upon the grinding wheels. of grinding 23, this being different from the cen- The apparatus known hitherto either did not tre 8 of the gearwheel to be ground. These two produce the desired precision, an account of the centres are variable according to the diameter 15 fact that they comprise many parts each being and the characteristics of the gear wheel. susceptible to a clearance or the microscopic dis- In Figure 4, the apparatus has been shown with placements of the tool to be dressed can only be the support of the hard point It withdrawn. obtained by operations which are very dimcult to Referring to Figs. 2, 3 and 4, the apparatus carry out, thereby necessitating particularly shown therein consists of a horizontal rectangular 20 clever persons. plate I which is secured to the machine frame The apparatus of the present invention has been by a vertical axle 26 and carries a guide into which combined in order to present as few pieces as is fitted a second horizontal plate 2. By the acpossible in order to avoid the clearance between tion of a spring 5 situated between the lug 28 of these pieces and consequently a lack of precision. the plate 2 and a supporting washer 29 mounted 25 This apparatus is also provided with driving on an adjustable screw 1 which is screwed into means of which the relatively large displacements the plate, 5 the plate 2 is always held in contact being easily effected by-hand, correspond to microwith an adjustable screw 6 mounted on a support scopic displacements of the hard point for dress- 30 secured to said plate 9.

30 ing the grinding wheels. As better'shown in Fig. 4, a lever 3, which is 30 Further characteristics of the invention will be pivotally mounted on an axle 3| secured to the set forth in the following description with refplate l, bears against a roller 4 mounted below the erence to the accompanying diagrammatic drawplate 2. By turning the lever 3 from right to left, ings in which like parts throughout the several the plate 2 will be displaced in its guide from left views will be designated by like reference charto right and will thereby compress the spring 5 35 acters. which will then bring the plate Z'against a stop- Fig. 1 is a diagram relating to the construction screw l. A circular sector 8, hereinafter called the of dressing apparatus according to the invention. operating sector, is pivotally mounted on an axle Fig. 2 is a partial top plan view of the device 23 secured to the plate 2 and movably mounted comprising t e p se invention p a in a in a circular guide 32 which in its turn is se- 40 a e Similar to the diagram 0! 8 cured to the plate 2. The angular displacements 3 is anleleva-tional View of the deviceof the sector 9 are obtained by moving the ban- Flg. 4 is a top plan view of the device shown i dle I0 carried thereby and they are limited on 2 with the diamond supporting members either side by adjustable stops 33 and 34 mounted moved therefrom. on Said v plate 2. Said operating sector 9 carries 9., 5 sectmnal detail 9 rectangular slide n m whichis slidably mounted g gl z zg gli iigifi the members shown a member l2. Member I2 is held for regulatin mFig 5 un bled purposes in a given position by means of two Fig. 7 is a side elevation of the frame of the screwsit If 50 machine tool on which is mounted the app The member 15 Se provided with a metus according to the present invention, and tilinear guide ll adapted to receive a ruler l3 Fig. 8 is a top plan view of said frame. which slides without play and is held at the top Referring to Fig. 1, the apparatus herein repreby two strips 36 screwedto the memb r I2, 56 sented consists, in principle, of a member l3 hav- To the top of ruler l3, Fig. 2, is secured by screws 3? a tool holder 38 carrying a diamond M orlike tool having'a hard point. The ruler l3, Figs. 4, 5 and 6, is provided at one end with a slot i5 adapted for the insertion of an axle 46 provided with a shoulder having a flat portion in order to prevent it from turning. The said axle, which is threaded in the interior, is held fast after it has been adjusted on the ruler l3 by means of a screw it provided with a shoulder. The axle is pivotally mounted through an end of link ll, permitting the ruler 83 to pivot about its fixing point.

The opposite end of said link I1 has pivotally.

mounted therethrough an axle l8 which is further secured to a ruler Ed. said link I! may be made in a single piece, as shown in-Fig. 4, or in several pieces in order to vary the distance between the centers of the axles i6 and I8.

Said ruler i3 is provided with a slot 39 and is 'slidably mounted in a cut out part of a member 20. Said ruler 69 can be secured to said member 20 after adjustment by a set-screw 40. The displacement of the ruler 19 relative to the member 20 is effected by a milled nut, the edge of which is fitted into a notch in the ruler l3, while the nut 2i is movable along a screw 4| which is mounted on the side of said member 20. Said member 20 has a cut out part having a guide 42 secured to the operating plate 2 engaging therewith for ensuring the straight movement of said member. A slot 43 formed through member 20 and having a screw 44 situated therein and mounted upon member 42 provides a means for holding the member 20 relative to guide 42 by tightening the nut upon screw 44. The displacement of the member 20 with reference to the guide 42 is effected by a micrometer screw 22 which bears at one end upon the plate .2 by means of a strap 45 and is screwed at the other end into the member 20.

The operation of the apparatus is as follows. The handle 00 being in its starting position against the stop 33 is moved in the direction of the arrow in order to bring it against the stop 34. During this movement, the axle I6 is described a circular arc about the axle I8. the rigid device con-- sisting of the sector 9 and the member 12 describes the circular arc about the axle 23, and the rigid device consisting of the ruler l3 and the diamond I4 is urged in such a manner as to describe, on the one hand, a circular are about the axle l8, and on the other hand, to slide in the guide of the member l2 while pivoting about the axle 46. The result of these movements is a curve, the effective part of which coincides with the portion of the evolute which is used in forming the teeth of gear wheels.

When the handle it! is in the position shown in Fig. 2 against the stop 34 and the lever 3 is in the position shown in Fig. 4, the lever 3 is turned to the left and thus the plate 2 and the members which it carries will recede to the right. The point of the diamond It will thus describe a straight line starting from the beginning of the evolute, that is, the pitch circle, and proceeding toward the centerof the gear wheel. This will afford a cut out part at the bottom of the tooth of the gear wheel, which is useful in the case of a small number of teeth.

To place the axle I8 in its initial position, members 2| and 22' are rotated.

The distance between the axle 23 and the diamond point M will depend upon the diameter of the gear wheel to be ground and this distance is determined by the position of the member I! on the guide ii and the position of the axle 46 on the ruler i3. fly suitably adjusting the position of the members i2, i3, 66', i9 and 2b, the diamond point N can be made to describe a curve corresponding to the outline of any desired gear wheel.

It will be observed that owing to the relativeposition, it is necessary to effect a considerable displacement of the regulating members in order to obtain a very slight variation in the outline. For this reason, the apparatus produces results which are remarkably precise.

The apparatus according to the present invention may be placed on a frame of a grinding machine-or gearing teeth. As shown in Figs. '7 and 8, the gear to be-ground is mounted on an axle 24 while the apparatus according to the present invention is mounted on the carriage 25. The axle 26, shown in Fig. 3 of said apparatus, is engaged in a suitable opening 21 of the carriage 38. This carriage is especially displaceable towards the grinding wheel M in order to bring the d.amond I4 into contact with said grinding wheel M. In Fig. '7, there has been diagrammatically shown in dotted lines a possible position of the apparatus according to the present invention an the frame of a machine for'grinding gearing teeth.

It is obvious thatthe forms of construction herein described and represented are given solely by way of example, and that it is feasible to modify,

in any suitable manner, the number, size, shape, nature and assembling of the several parts, without departing from the spirit of the invention. Principally, the sector 9 may be replaced by any other member which may be controlled in any possible manner. The sliding of the diamond holder may be effected in any manner desired. The length of the link may be adjustable in order to facilitate the adaptation of the apparatus to the characteristics of the different gear wheels to be ground. The adjustment of the fixed point of the link can be effected by any suitable means.

Verniers may be mounted at any points at which they may be necessary. The sliding members may be arranged in any suitable manner. They may beprovlded with ball bearings, devices for lubricating, matching, and the like.

I claim:

1. Apparatus of precision for dressing grinding wheels used upon gearing teeth, comprising a carriage, an oscillating support mounted on said carriage in such a manner that its axis of oscillation does not coincide with that of the gear to be ground, said support having a slide formed therewith, a member bearing the hard pointed tool adapted for dressing the grinding wheel mounted upon said slide, said tool being capable of sliding in said member, a link and a fixed member connected by said link to said tool and whose position with respect to the axis of oscillation of said support may be adjusted by hand through the intermediary of screws in order to give the hard point microscopic displacements.

2. Apparatus of precision for dressing grinding wheels used upon gearing teeth as claimed in claim 1, a handle provided on said carriage bearing said oscillating support for the dislating the initial position of said carriage.

3. Apparatus of precision for dressing grinding wheels used upon gearing teeth as claimed in claim 1, said oscillating support having the shape of a sector, a handle for operating said support and an adjusting screw adapted to regulate the initial position of said support.

4. Apparatus of precision for dressing grinding wheels used upon gearing: teeth as claimed in claim 1, means for adjusting the position of said fixed or adjustable member comprising two perpendicular slides provided with screws which permit them to be displaced in their respective direction.

MAURICE GERMAIN EDMOND PHILIPPE. 

